Investments (Past Due and Interest Accrual Status of Mortgage Loans) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	$ 93,710	$ 84,290
Greater than 90 Days Past Due and Still Accruing Interest	57	39
Financing Receivable, Nonaccrual	933	762
Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	671	603
Commercial Mortgage Loans
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	60,759	52,502
Greater than 90 Days Past Due and Still Accruing Interest	19	6
Financing Receivable, Nonaccrual	277	169	$ 155
Commercial Mortgage Loans | Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	138	6
Residential Mortgage Loans
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	13,129	12,482
Greater than 90 Days Past Due and Still Accruing Interest	16	12
Financing Receivable, Nonaccrual	421	462	442
Residential Mortgage Loans | Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	435	473
Agricultural Mortgage Loans
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	19,822	19,306
Greater than 90 Days Past Due and Still Accruing Interest	22	21
Financing Receivable, Nonaccrual	235	131	$ 225
Agricultural Mortgage Loans | Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	$ 98	$ 124